89' 740GL B230F, new dectector in exhaust fanifold, new theromstat, installed new timing belt and seals, new flame trap and hose, new vacume hoses, cleaned throttle body and reset throttle position sensor, speedometer & odemeter have always been intermintent - sometimes speedometer will be pegged at top speed, sometimes work fine for many miles, sometimes not work at all.
All is fine for many months, now it will start fine and idel at 800, until it warms up, and goes to 1,500. THANK YOU !